Summary
Chronic respiratory failure (CRF) is caused by a decrease in the capacity of the respiratory muscles (e. g., neuromuscular diseases) or an increase in load (e. g., kyphoscoliosis or obstructive lung disease) or both. CRF is characterized by hypercapnia and hypoxemia. The degree of hypercapnia is directly related to the increase of the load and decrease of the capacity of the respiratory muscles and acts therefore as an indicator.
Are there strategies of the respiratory muscles which serve to protect themselves from fatal fatigue? From the teleological point of view one could create a hypothesis based on the typical change of breathing patterns in patients with CRF. For example, the increased load due to the compromised lung and chest wall mechanics in patients with severe kyphoscoliosis by a chronic increase of energy consumption leads to energy depletion in the respiratory muscles. As a protective strategy, the work of breathing is decreased below the threshold of respiratory muscle failure via the reduction of tidal volume and minute ventilation, respectively. Simultaneously, the increased breathing frequency compensates for the reduced tidal volume in order to guarantee the neccessary minute ventilation. However, the simultaneous decrease of the alveolar ventilation due to an increased dead space is associated with a reduced gas exchange characterized by hypoxemia and hypercapnia. The respiratory center adapts to the limited capacities of the respiratory muscles, adjusting its output in a way that the work of respiratory muscles will not exceed the muscle fatigue level. Accordingly, the sensitivity of the CO2 chemoreceptors must be blunted in order to avoid an increase of the breathing drive and to reach a „permissible hypercapnia“.In this hypothesis secondary hypoventilation and hypercapnia, respectively, may be viewed as an intelligent compensating mechanism to the reduced capacity of the respiratory muscles or increase in load. Furthermore, slowly developing hypoxemia and hypercapnia are compensated by cellular and circulatory adaptation mechanisms.
Vorabdruck mit freundlicher Genegmigung des Steinkopff Verlags.Aus: Intensivmedizin (1997); (erweiterte Fassung des Vortrags auf der Tagung „Nichtinvasive nasale Maskenbeatmung — Brücke zur Lungentransplantation?“ 14./15.11.1996 in Dresden)
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Schönhofer, B. (1997). Hyperkapnie — Symptom oder protektive Strategie?. In: Paditz, E. (eds) Nasale Maskenbeatmung im Kindes- und Erwachsenenalter. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60853-7_11
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DOI: https://doi.org/10.1007/978-3-642-60853-7_11
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